No-glare device.



M. LUCKIESH.

NO-GLARE DEVICE.

APPLICATION FILED NOV. 3, 1915.

Patented May 22,1912.

mmgwzu [N S/ENTUH MATT L UC'KZ'ESH MATT LUCKIESH, 0F CLEVELAND, OHIO, ASSIGNOR TO GENERAL ELECTRIC COMPANY.

' A CORPORATION OF NEW YORK.

Iil'O-GLARE DEVICE.

Specification of Letters Patent.

Patented May 22, 191W.

Application flied November 3, 1915. Serial No. 59,368.

' plish this purpose that certain of the light which is transmitted above the horizontal be eliminated or diffused. Ordinancesrin force in various loealitieszpltovide inj efi'et that no light shallbe transmitted from a headlight which will encounter the eyes of another vehicle driver or a pedestrian at a certain distance from the headlight.' The object of my invention is to provide a device which will accomplish the purpose stated, and which at the same time will be very economical in construction and convenient of application. It will be obvious also that my invention may be applied to light sources other than vehicle lamps for the purpose of preventing glare.

My invention consists in providing the headlight with means whereby light Which would otherwise be transmitted above the horizontal will be eflectually obscured or diflused, except a certain proportion of said light which is transmitted upwardly at so great an angle to the horizontal that it has no deleterious effect but is rather an advantage. On the other hand, my invention provides a very eflicient means for allowing the transmission of the light which is emitted at angles below the horizontal. carrying out my invention I provide a screen which will allow the unobstructed passage of light in two directions, that is, upwardly and downwardly. The screen is so constructed that it will allow to pass, unobstructed, beams of light which are-emitted from the light source or reflector downwardly at comparatively small angles with the horizontal, while it will allow the unobstructed transmission only of such beams which are emitted upwardly as make substgntially greater angles with the horizonta In carrying out my invention I prefer to provide a glass or other transparent screen which may constitute the cover-plate of the lamp with a series of substantially horizontal bands on each of the opposite faces thereof, there being clear spaces between consecutive bands on each side. The respective series of bands are so disposed that the angle which a line drawn from a point located in a clear space on the inside of the screen makes with a corresponding point located within the next clear space thereabove on the outside of the screen will be greater thanthe angle made by a line connecting the formert withi accorresponding pointonthe nextlower space on the opposite side of the screen. One way of accomplishing this purpose is to have the bands of uniform width and slightly wider than the clear spaces, and by having the lower edge of a band on the outside of the screen substantially opposite to the upper edge of a band on the inside of the screen. At least, each space on the outside of the screen should be closer to the upper edge of the opposite inside band than it is to the lower edge thereof. The bands may be opaque, but it is preferred that they be translucent so that theyvdiffuse rather than totally out off. the light which encounters them.

My invention will be more clearly understood by referring to the accompanying drawing, in which Figure 1 is a vertical section of an automobile lamp comprising my invention. Fig. 2 is a front elevation of a screen comprising my invention, and Fig. 3 is an end elevation thereof.

Referring to the drawing, 10 is an electric incandescent lamp of the miniature type which is ordinarily used. 11 is a reflector surrounding the said lamp, the lamp being also provided with the usual casing and connections 12 and 13. In place of the ordinary transparent cover glass the lamp is provided with a screen 14, which is made according to my invention, as shown more in detail in Figs. 2 and 3. The outside of the glass 14 is provided with a series of difi'using bands 15, and the inner surface of the glass is provided with a series of difi'using bands 16. These bands may be made by etching or otherwise treating the surface of the glass according to well known methods, or they may be composed of a glass of a diffusing or light modifying character, such as white translucent glass. As shown in the drawing, the bands 15 and 16 are of the same width, and this is the preferred construction. Alternating with the bands 15, which are preferably horizontally extending are clear spaces 17, and alternating with the diffusing bands 16, which are parallel to the bands 15, are clear spaces 18.

It will be apparent that light which is emitted from the light source 10 or reflector 11 in a horizontal direction will encounter one or more of the diffusing bands and will be broken up thereby, thus preventing glare therefrom. It will be apparent, also, that light which is emitted in an upward direction at angles to the horizontal less than that of the ray which is indicated as A in Fig. 3 will also be diffused. On the other hand, light which is emitted in a downward direction at any angle to the horizontal between that made by the rays B and I), as for instance the ray 0, will be transmitted. The light emitted at angles above that of the ray A will be useful to a certain extent to warn others of the approach of the vehicle, while it obviously is not in such a direction as to cause glare. The angles within which the light may be transmitted downwardly are such as to allow the projection of the light considerably in advance of the vehicle, and thus to accomplish efiiciently the purpose of the headlight.

What I claim as new and desire to secure by Letters Patent of the United States, is,-

1. In a lamp for vehicles, the combination of a light source and a reflector which reflects the light rays both below and above the horizontal, with a light modifying means allowing the transmission of the greater portion of the rays reflected below the horizontal and a small portion of the rays above the horizontal which more nearly approach the vertical, but obstructing the greater portion of the rays above the horizontal which more nearly approach the horizontal.

2. In a lamp, the combination of a light source and a screen disposed in front of said source, said scree'h being provided on one face thereof with a series of light obstructing bands with intermediate clear spaces,

andmeans upon the opposite face of said screen cooperating therewith for allowing the transmission of the greater portion of the rays below the horizontal but obstructing the greater portion of the rays above the horizontal.

3. In a lamp, the combination of a light source and a screen of a transparent material mounted in front of said light source,

said screen being provided upon the inside and outside thereof with series of substantially horizontal light obstructing bands with intermediate clear spaces upon the outside of'said screen being so disposed relatively to those on the inside thereof that a line connecting the lower edge of a band upon the inside with the lower edge of the next higher band on the outside will make a greater angle with the horizontal than a line connecting the said lower edge of the inside band with the lower edge of the next outside band therebelow.

4;. In a lamp, the combination of a light source and a screen of transparent material mounted in front of said light source, said screen being provided with series of sub-' 

